Many commercial buildings in the UK require an Energy Performance Certificate when it is constructed, sold or let.
This EPC is displayed in a similar way to that of a domestic property, with the energy rating shown on an A-G scale. As with a domestic EPC, a commercial EPC is valid for 10 years.
As soon as a building is in the process of being offered for sale or rent, it is the responsibility of the seller or landlord (i.e. the relevant person) to make available free of charge an EPC to any prospective buyer or tenant. The EPC must be provided by the seller or landlord at the earliest opportunity. Before a building is put on the market the seller or landlord must commission an EPC for the building.
You can be fined between £500 and £5,000 based on the rateable value of the building if you don't make an EPC available to any prospective buyer or tenant.
The energy assessor will either draw up their own floor plans or require plans. They will then carry out a survey including all the thermal elements in the building including heating, ventilation, lighting, air conditioning, as well as the buildings structure.
This information will then be fed into SBEM Simplified Building Energy Model. It is a piece of design software which is used to calculate the energy efficiency of the building.